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Research on casting technology of aluminum casting of high-speed rail rocker shell

2022-05-31 15:07

Abstract|ZL105A alloy is used to produce rocker shell castings. According to the structural characteristics and performance requirements of ZL105A alloy and castings, the comprehensive performance optimization of ZL105A alloy was carried out from four aspects: melt refining, alloying, casting process design and ProCAST simulation, and the casting process of rocker shell castings was analyzed. gist. The results show that the comprehensive mechanical properties of ZL105A alloy can be effectively improved by using hexachloroethane and argon rotary blowing compound refining, combined with Be alloying. The low-pressure sand casting process, combined with the bottom casting + gap casting system and the method of placing cold iron in thick and large parts, can produce rocker shell castings with good internal quality, with the highest tensile strength, yield strength and elongation of the casting body. Up to 318 MPa, 261 MPa, 5.6%, the body fatigue performance, internal quality and size all meet the design requirements.

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Calculation Of Casting Cooling Time

2022-05-23 17:16

In order to prevent the castings from being deformed, cracks and other defects due to excessive cooling after pouring, and to ensure that the castings have sufficient strength and toughness during sand cleaning, the castings should have sufficient cooling time in the mold. Continuously produced castings should be designed with sufficient cooling section length to ensure the cooling time of the castings. The in-mold cooling time of the casting is related to the weight, wall thickness, complexity, alloy type, mold properties, production conditions and other factors of the casting.

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Improve The Inspection Efficiency Of Batch Aluminum Die Castings Through Automatic Extraction Of X-Ray Imaging Defect Features

2022-03-31 16:25

In order to solve the problem of the lack of feature extraction dimension of typical defects in X-ray images of aluminum alloy die castings, and the influence of a large number of manual interventions on the feature extraction efficiency, a feature extraction algorithm of typical defects in X-ray imaging of aluminum alloy die castings was proposed. This method establishes multiple feature analysis dimensions for typical defects such as pores, under-casting and deformation in aluminum alloy die-casting parts, uses filtering denoising, threshold segmentation and other means to preprocess the die-casting part image, and extracts the defect perimeter and area by extracting the defect perimeter and area, etc. Multi-dimensional features, realize automatic feature extraction of pores and slag inclusion defects. The application in the actual production of aluminum alloy die castings in some enterprises shows that this method can effectively extract the typical defect characteristics of aluminum alloy die castings, which can provide a reference for subsequent defect detection and identification.

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Research On Improvement Of Wear Resistance Of Die-Casting Mold Baffle Based On Reasonable Heat Treatment Process

2022-03-23 14:01

Abstract|Based on the as-supplied experimental steel for the die-casting mold baffle, it was subjected to homogenization annealing at 1100 ℃ for 2 h, water quenching at 880 ℃ for 30 min, and tempering at 200 ℃ and 250 ℃ for 2 h, respectively. The microstructure, macrohardness, tensile properties and wear resistance were measured. The results show that after quenching and tempering, the flaky pearlite and reticulated ferrite in the experimental steel as supplied by the die are transformed into tempered martensite and a small amount of retained austenite, and the tensile strength and hardness are significantly increased. . The wear resistance of quenched + 200 ℃ tempering test steel is the best, followed by 250 ℃ tempering, both of which are better than the wear resistance of the as-delivered mold.

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Development Of Heat Treatment Process For Die Casting Automobile Cross Beam Structural Parts

2022-03-08 13:23

The solution and aging T7 heat treatment of AlSi10MnMg alloy test rods was introduced. The influence relationship model between heat treatment process parameters and mechanical properties of castings and the optimal heat treatment process parameters were obtained through the minitab experimental design and response optimization tool. Ontology slice verification of automobile beam structure confirms the validity of the optimal parameter combination. With the development of new energy electric vehicle technology, body structural parts tend to be large, thin-walled, high-strength, and high-tough. These structural parts are mostly made of aluminum alloys, which are formed by high-vacuum die-casting, and finally heat-treated to obtain structural parts that are lightweight and high-strength. There has been a lot of research on the die casting and heat treatment process of body structural parts such as shock towers, longitudinal beams, and cross beams. Studies have shown that there is a complex relationship between the mechanical properties of die castings, material components, internal pores, and heat treatment processes. For example, under certain temperature conditions, appropriately increasing the solution temperature can increase the yield strength, but it will increase the surface bubbles of the product. Different combinations of heat treatment processes and sampling of the die casting itself have problems of instability. Therefore, it is necessary to fix the alloy composition and internal quality as much as possible to study the influence of different heat treatment process parameters on the mechanical properties of die castings, and to clarify the specific relationship model formula. AlSi10MnMg aluminum alloy has good casting properties and mechanical properties, and is widely used in thin-walled and complex automotive structural parts. This topic combines the development of a heat treatment process for automotive beam structural parts, and systematically introduces the use of the same die-casting batch of standard test bars , Between the actual heat treatment equipment and the controllable solid solution, aging temperature and time (production efficiency) of the product, through experimental design and optimization, the optimal heat treatment process parameters are sorted out to provide a reference for the development of new product heat treatment process plans. 1 Basic introduction of the product

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Research Status And Prospect Of Numerical Simulation Of Rheological Deformation Of Semi-Solid Casting Alloys

2022-02-18 14:44

Abstract|Numerical simulation of alloy rheological deformation can effectively predict the filling and solidification process in semi-solid forming. The pressure field, velocity field, solid phase distribution, filling speed, filling temperature, and defects in the forming process are analyzed. Process and design-related program optimization provides relevant decision-making assistance. The theoretical basis of numerical simulation technology of alloy rheological deformation in recent years is reviewed, as well as the research progress and future development direction of rheological deformation alloys at home and abroad. The semi-solid slurry breaks the traditional casting forming mode, can form spherulites, can effectively reduce internal defects, improve the mechanical properties of the alloy, and has a lower forming temperature, the thermal shock of the mold is relatively small, and the use of the mold is relatively small. Lifespan is extended. Due to the characteristics of less energy consumption, lower cost and better quality, semi-solid rheological forming has gradually become the main trend of semi-solid forming technology development and technology promotion. The process of semi-solid rheological formation is a complex process involving the changes of various physical fields, such as temperature field, stress field, flow field, velocity field and so on. Because the semi-solid rheological forming technology combines many advantages of traditional casting, forging and other processing methods, it has been successfully applied to the lightweight design and production of transportation, aerospace and other fields, and has good application prospects. The semi-solid rheological forming process has a high temperature, and the internal changes during the test process are difficult to observe. The computer simulation technology can be used to simulate the filling and solidification processes of semi-solid forming. Through computer simulation, the test cycle can be effectively shortened, the material consumption can be reduced, and the experimental danger can be avoided. It can predict the change law of the physical field quantities of the semi-solid slurry during the rheological deformation process and the possible positions and types of defects in the components, which has important guiding significance for the optimal process parameter design and scheme optimization of rheological deformation.

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New product, aluminum die-casting and then CNC machining, material: ADC12

2022-01-28 14:01

New product, aluminum die-casting and then CNC machining, material: ADC12

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New product blank developed by our technical engineer team, A35T6 material, aluminum gravity casting

2022-01-21 16:07

New product blank developed by our technical engineer team, A35T6 material, aluminum gravity casting

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